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 <h1 id="develop-microservice-with-jax-rs">Develop Microservice with JAX-RS</h1>
 <h2 id="concept-description">Concept Description</h2>
 <p>ServiceComb supports developers in developing services in JAX-RS mode by using JAX-RS.</p>
 <h2 id="development-example">Development Example</h2>
 <ul>
 <li><strong>Step 1</strong> Import dependencies into your maven project:</li>
 </ul>
 <p><code>xml
     &lt;dependencyManagement&gt;
      &lt;dependencies&gt;
        &lt;dependency&gt;
          &lt;groupId&gt;org.apache.servicecomb&lt;/groupId&gt;
          &lt;artifactId&gt;java-chassis-dependencies&lt;/artifactId&gt;
          &lt;version&gt;1.0.0-m1&lt;/version&gt;
          &lt;type&gt;pom&lt;/type&gt;
          &lt;scope&gt;import&lt;/scope&gt;
        &lt;/dependency&gt;
      &lt;/dependencies&gt;
     &lt;/dependencyManagement&gt;
     &lt;dependencies&gt;
       &lt;!--transport can optional import through endpoint setting in microservice.yaml, we import both rest and highway as example--&gt;
       &lt;dependency&gt;
         &lt;groupId&gt;org.apache.servicecomb&lt;/groupId&gt;
         &lt;artifactId&gt;transport-rest-vertx&lt;/artifactId&gt;
       &lt;/dependency&gt;
       &lt;dependency&gt;
         &lt;groupId&gt;org.apache.servicecomb&lt;/groupId&gt;
         &lt;artifactId&gt;transport-highway&lt;/artifactId&gt;
       &lt;/dependency&gt;
       &lt;dependency&gt;
         &lt;groupId&gt;org.apache.servicecomb&lt;/groupId&gt;
         &lt;artifactId&gt;provider-jaxrs&lt;/artifactId&gt;
       &lt;/dependency&gt;
       &lt;dependency&gt;
         &lt;groupId&gt;org.slf4j&lt;/groupId&gt;
         &lt;artifactId&gt;slf4j-log4j12&lt;/artifactId&gt;
       &lt;/dependency&gt;
     &lt;/dependencies&gt;</code></p>
 <ul>
 <li><strong>Step 2</strong> Implement the service. JAX-RS is used to describe the development of service code. The implementation of the Hello service is as follows:</li>
 </ul>
 <p>```java
    import javax.ws.rs.POST;
    import javax.ws.rs.Path;
    import javax.ws.rs.Produces;
    import javax.ws.rs.core.MediaType;
    import org.apache.servicecomb.samples.common.schema.models.Person;</p>
 <p>@Path("/jaxrshello")
    @Produces(MediaType.APPLICATION_JSON)
    public class JaxrsHelloImpl {
      @Path("/sayhi")
      @POST
      public String sayHi(String name) {
      　return "Hello " + name;
      }</p>
 <pre><code> @Path("/sayhello")
  @POST
  public String sayHello(Person person) {
    return "Hello person " + person.getName();
  }
 </code></pre>
 <p>}
    ```</p>
 <p><strong>Note: PLEASE MAKE SURE TO MARK @Path ON YOUR PRODUCER(JaxrsHelloImpl), OR THE PATH AND METHOD OF PUBLISHED WILL BE INCORRECT!</strong></p>
 <p>In this sample the Path of sayHi is <code>/jaxrshello/sayhi</code>, and the Path of sayHello is <code>/jaxrshello/sayhello</code>, if you wish them <code>/sayhi</code> and <code>/sayhello</code>, please change the setting of <code>@Path</code> on the JaxrsHelloImpl to <code>@Path("/")</code>.</p>
 <ul>
 <li><strong>Step 3</strong> Release the service. Add <code>@RestSchema</code> as the annotation of the service implementation class and specify schemaID, which indicates that the implementation is released as a schema of the current microservice. The code is as follows:</li>
 </ul>
 <p><code>java
    import org.apache.servicecomb.provider.rest.common.RestSchema;
    // other code omitted
    @RestSchema(schemaId = "jaxrsHello")
    public class JaxrsHelloImpl implements Hello {
      // other code omitted
    }</code></p>
 <p>Create the jaxrsHello.bean.xml file in the resources/META-INF/spring directory and configure base-package that performs scanning. The content of the file is as follows:</p>
 <p>```xml
    <?xml version="1.0" encoding="UTF-8"?></p>
 <p><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xmlns:p="http://www.springframework.org/schema/p" xmlns:util="http://www.springframework.org/schema/util"
           xmlns:cse="http://www.huawei.com/schema/paas/cse/rpc"
           xmlns:context="http://www.springframework.org/schema/context"
           xsi:schemaLocation="http://www.springframework.org/schema/beans classpath:org/springframework/beans/factory/xml/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.huawei.com/schema/paas/cse/rpc classpath:META-INF/spring/spring-paas-cse-rpc.xsd"></p>
 <pre><code>   &lt;context:component-scan base-package="org.apache.servicecomb.samples.jaxrs.provider"/&gt;
 </code></pre>
 <p></beans>
    ```</p>
 <ul>
 <li><strong>Step 4</strong> Add service definition file:</li>
 </ul>
 <p>Add <a href="http://servicecomb.incubator.apache.org/cn/users/service-definition/">microservice.yaml</a> file into resources folder of your project.</p>
 <ul>
 <li><strong>Step 5</strong> Add Main class:</li>
 </ul>
 <p>```java
    import org.apache.servicecomb.foundation.common.utils.BeanUtils;
    import org.apache.servicecomb.foundation.common.utils.Log4jUtils;</p>
 <p>public class Application {
      public static void main(String[] args) throws Exception {
         //initializing log, loading bean(including its parameters), and registering service, more detail can be found here :  http://servicecomb.incubator.apache.org/users/application-boot-process/
         Log4jUtils.init();
         BeanUtils.init();
      }
    }
    ```</p>
 <h2 id="involved-apis">Involved APIs</h2>
 <p>Currently, the JAX-RS development mode supports the following annotation. For details about how to use JAX-RS, see <a href="https://jax-rs-spec.java.net/nonav/2.0-rev-a/apidocs/index.html">JAX-RS official documentation</a>。</p>
 <table>
 <thead>
 <tr>
 <th style="text-align: left;">Remarks</th>
 <th style="text-align: left;">Location</th>
 <th style="text-align: left;">Description</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td style="text-align: left;">javax.ws.rs.Path</td>
 <td style="text-align: left;">schema/operation</td>
 <td style="text-align: left;">URL path</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.Produces</td>
 <td style="text-align: left;">schema/operation</td>
 <td style="text-align: left;">Coding/decoding capability supported by the method</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.DELETE</td>
 <td style="text-align: left;">operation</td>
 <td style="text-align: left;">http method</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.GET</td>
 <td style="text-align: left;">operation</td>
 <td style="text-align: left;">http method</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.POST</td>
 <td style="text-align: left;">operation</td>
 <td style="text-align: left;">http method</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.PUT</td>
 <td style="text-align: left;">operation</td>
 <td style="text-align: left;">http method</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.QueryParam</td>
 <td style="text-align: left;">parameter</td>
 <td style="text-align: left;">Obtain parameters from query string</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.PathParam</td>
 <td style="text-align: left;">parameter</td>
 <td style="text-align: left;">Obtain parameters from path, This parameter must be defined in path.</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.HeaderParam</td>
 <td style="text-align: left;">parameter</td>
 <td style="text-align: left;">Obtain parameters from header.</td>
 </tr>
 <tr>
 <td style="text-align: left;">javax.ws.rs.CookieParam</td>
 <td style="text-align: left;">parameter</td>
 <td style="text-align: left;">Obtain parameters from cookie.</td>
 </tr>
 </tbody>
 </table>
 <blockquote>
 <p><strong>NOTE</strong>：
 - When the method parameter has no annotation and is not an HttpServletRequest parameter, the parameter is of the body type by default. One method supports a maximum of one body-typed parameter.
 - You are advised to explicitly define the value of the parameter. Otherwise, the parameter name in the API definition is used, such as <code>@QueryParam\("name"\) String name</code> String name instead of <code>@QueryParam String name</code>.</p>
 </blockquote>


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